Molten lithium nitrate-potassium nitrate eutectic: some reactions of copper(II) and of metallic silver |
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| Affiliation: | 1. Dipartimento di Scienze Chimiche, Biologiche, Farmaceutiche ed Ambientali, Università degli Studi di Messina, V.le F. Stagno d''Alcontres, 31, I-98166 Messina, Italy;2. Dipartimento di Fisica e Chimica, Università degli Studi di Palermo, Viale delle Scienze, I-90128 Palermo, Italy |
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| Abstract: | Copper(II) nitrate trihydrate has been successfully dehydrated in lithium nitrate-potassium nitrate eutectic at 140°C. At 300°C it commenced reaction as a Lux-Flood acid precipitating copper(II) oxide. With potassium iodide it reacted at 140°C to form copper(I) iodide and iodine but at 180°C the insoluble product was a mixture of copper(I) iodide and copper(II) oxide. With powdered silver a violent reaction occurred at 160°C, yielding silver(I) cations, nitrogen dioxide and copper(II) oxide. The stoichiometries of these reactions have been established and some reaction pathways suggested. Metallic silver was found to react to a much larger extent with a Lux-Flood acid (pyrosulphate) in solution than with nitrogen dioxide giving support to the nitryl cation as the acidic species in nitrate melts. |
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